session-android/res/drawable/media_camera_button_background.xml

<?xml version="1.0" encoding="utf-8"?>
<ripple
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:color="@color/core_grey_45">
    <item android:id="@+id/mask">
        <shape>
            <corners android:radius="1000dp" />
            <solid android:color="@color/white" />
        </shape>
    </item>
    <item>
        <shape android:shape="oval">
            <solid android:color="@color/core_white" />
        </shape>
    </item>
</ripple>